From: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Venkatesh Pallipadi <venki@google.com>,
Sitsofe Wheeler <sitsofe@yahoo.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Interrupt latency on some 945GM platforms
Date: Fri, 17 Sep 2010 10:02:08 +0100 [thread overview]
Message-ID: <201009171002.09187.simon.farnsworth@onelan.co.uk> (raw)
In-Reply-To: <201009161803.10531.anarsoul@gmail.com>
On Thursday 16 September 2010, Vasily Khoruzhick <anarsoul@gmail.com> wrote:
> В сообщении от 15 of September 2010 01:41:11 автор Sitsofe Wheeler написал:
> > > > processor.max_cstate=2
> > >
> > > Nope, it doesn't work with max_cstate=2
> >
> > Perhaps intel_idle is being used? Any mention of it in dmesg?
>
> Sitsofe, maybe you misunderstood me, I mean with max_cstate=1 graphics is
> smooth, with higher values (i.e. max_cstate=2) graphics is jerky.
>
> Btw, Jesse, any comments/solutions/workarounds except one with
> processor.max_cstate=1 in kernel commandline? Should I file a bug on fdo
> bugzilla?
This looks like a problem I've seen on some hardware.
My workaround has been to use the pm_qos /dev/cpu_dma_latency interface to
request a maximum latency of 1ms (value chosen as definitely small enough - a
larger value may be better, but I don't care about power saving at runtime on
my kit).
If it's happening on other kit, perhaps the i915 driver should make a suitable
pm_qos request itself. Jesse, can you comment?
--
Simon Farnsworth
Software Engineer
ONELAN Limited
http://www.onelan.com/
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next prev parent reply other threads:[~2010-09-17 9:02 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 20:36 vsync problems with recent graphics stack and 945gm Vasily Khoruzhick
2010-09-13 20:44 ` Jesse Barnes
2010-09-13 21:10 ` Vasily Khoruzhick
2010-09-13 21:19 ` Interrupt latency on some 945GM platforms Jesse Barnes
2010-09-13 21:41 ` Vasily Khoruzhick
2010-09-13 21:46 ` Jesse Barnes
2010-09-13 21:52 ` Vasily Khoruzhick
2010-09-13 21:59 ` Jesse Barnes
2010-09-13 22:03 ` Vasily Khoruzhick
2010-09-14 0:55 ` Venkatesh Pallipadi
2010-09-14 8:09 ` Vasily Khoruzhick
2010-09-14 9:52 ` Thomas Gleixner
2010-09-14 12:29 ` Vasily Khoruzhick
2010-09-14 22:41 ` Sitsofe Wheeler
2010-09-15 7:07 ` Vasily Khoruzhick
2010-09-16 15:03 ` Vasily Khoruzhick
2010-09-16 18:07 ` Thomas Gleixner
2010-09-16 18:30 ` Vasily Khoruzhick
2010-09-16 18:42 ` Vasily Khoruzhick
2010-09-16 18:50 ` Thomas Gleixner
2010-09-16 20:06 ` Vasily Khoruzhick
2010-09-24 19:39 ` Jesse Barnes
2010-09-24 19:48 ` Vasily Khoruzhick
2010-09-24 19:51 ` Jesse Barnes
2010-09-26 10:53 ` Stefan Biereigel
2010-09-27 0:46 ` Shaohua Li
2010-09-27 2:52 ` Alexander Lam
2010-09-27 5:45 ` Stefan Biereigel
2010-09-27 11:41 ` Vasily Khoruzhick
2010-09-27 21:18 ` Vasily Khoruzhick
2010-09-30 20:23 ` Alexander Lam
2010-09-25 10:25 ` Paolo Ornati
2010-09-17 9:02 ` Simon Farnsworth [this message]
2010-09-17 16:30 ` [Intel-gfx] " Jesse Barnes
2010-09-17 12:50 ` Vasily Khoruzhick
2010-09-21 18:26 ` [Intel-gfx] " Paolo Ornati
2010-09-21 22:56 ` Jesse Barnes
2010-09-22 5:57 ` [Intel-gfx] " Vasily Khoruzhick
2010-09-23 18:21 ` Paolo Ornati
2010-09-25 10:28 ` Paolo Ornati
2010-10-16 15:54 ` [Intel-gfx] Interrupt latency on some 945GM platforms -- and TCP/IP silent data corruption? Paolo Ornati
2010-12-08 16:24 ` [PATCH] drm/i915: Use PM QoS to prevent C-state memory starvation of the GPU Chris Wilson
2010-12-08 16:44 ` Vasily Khoruzhick
2010-12-08 16:54 ` Chris Wilson
2010-12-08 17:00 ` Vasily Khoruzhick
2010-12-08 17:54 ` Andrew Lutomirski
2010-12-08 18:14 ` Vasily Khoruzhick
2010-12-08 18:19 ` Andrew Lutomirski
2010-12-08 18:55 ` Vasily Khoruzhick
[not found] ` <20110115113431.0e42f037@gmail.com>
2011-01-15 11:13 ` Chris Wilson
2010-09-24 18:41 ` Interrupt latency on some 945GM platforms Jesse Barnes
2010-09-14 9:55 ` Andi Kleen
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